Title :
Turbo demodulation for LDPC-coded high-order QAM in presence of transmitter angular skew
Author :
Koike-Akino, Toshiaki ; Millar, David S. ; Kojima, Keisuke ; Parsons, Kieran ; Yoshida, Takafumi ; Ishida, K. ; Miyata, Yoshikuni ; Matsumoto, Wataru ; Mizuochi, Takashi
Author_Institution :
Mitsubishi Electr. Res. Labs., Cambridge, MA, USA
Abstract :
We analyze demodulation methods for high-order QAM formats in the presence of quadrature angular skew caused by imperfect biasing of the transmitter. Proposed turbo demodulation improves skew tolerance of up to 33-degree angle for an SNR penalty of 1dB for 1024QAM.
Keywords :
demodulation; optical modulation; optical transmitters; parity check codes; quadrature amplitude modulation; LDPC-coded high-order QAM; SNR penalty; imperfect biasing; low-density parity-check codes; skew tolerance; transmitter angular skew; turbo demodulation; Decoding; Demodulation; Optical transmitters; Parity check codes; Quadrature amplitude modulation; Signal to noise ratio;
Conference_Titel :
Optical Communication (ECOC), 2014 European Conference on
Conference_Location :
Cannes
DOI :
10.1109/ECOC.2014.6964100
